4. The shallow pits where sea water is
collected for evaporation are called:
(a) ponds
(b) lakes
(c) lagoons
(d) rivers​

Answer:

accepted value

Explanation:

Answer:

cbbb vdf jfjd hx

Explanation:

Answer:

C. A combustion reaction.

Explanation:

Let's see why a combustion reaction would be the answer:

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant.

When a combustion reaction has a hydrocarbon as a reactant (a compound made up solely of carbon and hydrogen), the products of the combustion of hydrocarbons would be carbon dioxide and water. Many hydrocarbons are used as fuel because their combustion releases very large amounts of heat energy.

Based on this logic, the answer would be C. A combustion reaction.

3H₂(g)+N₂(g)——> 2NH₃ (g) , here the volume of NH₃(g) measured at STP is produced when 2.15 L of H₂(g) reacts is approximately 1.58 L of NH₃ gas will be produced when 2.15 L of H₂ reacts at STP.

3H₂(g) + N₂(g) → 2NH₃ (g)

3 moles of H₂ reacts to produce 2 moles of NH3. Therefore, one need to first calculate the number of moles of H₂ in 2.15 L.

PV = nRT

P= is the pressure (STP has a pressure of 1 atm), V =is the volume in liters, n is the number of moles, R= is the ideal gas constant (0.0821 L·atm/mol·K), T =is the temperature in Kelvin (STP has a temperature of 273 K).

Here, 

n(H₂) = (P(H₂) × V(H₂)) / (R × T)

Assuming the pressure of H₂ is also 1 atm at STP, and substituting the values:

n(H₂) = (1 atm × 2.15 L) / (0.0821 L·atm/mol·K × 273 K) n(H₂) ≈ 0.0954 mol

According to the balanced equation, 3 moles of H₂ react to produce 2 moles of NH3. Therefore, one can determine the number of moles of NH₃ produced:

n(NH₃ ) = (2/3) × n(H₂) n(NH₃ )

≈ (2/3) × 0.0954 mol n(NH₃ )

≈ 0.0636 mol

V(NH₃ ) = (n(NH₃  × R × T) / P(STP)

Substituting the values:

V(NH₃ ) = (0.0636 mol × 0.0821 L·atm/mol·K × 273 K) / (1 atm) V(NH₃ )

≈ 1.58 L

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Answer:

REDUCTION: Cu^+2 - 2e --> Cu

OXIDATION: Mg --> Mg^+2 +2e-

Explanation:

Remember the acronym LEO says GER. This means:

Losing Electrons is Oxidation

Gaining Electrons is Reduction

1. The first step in writing any balanced half reactions is to assign oxidation numbers to each atom on both the reactant and product side. Oxidation numbers are essentially the charges of each atom, and are usually just the charge of the atom.

Reactant side:

Cu: +2 (to cancel out 2 Cl - atoms)

Cl2: -1 (you do not consider the amount of atoms when assigning O.N.)

Mg: 0 (all atoms in pure elements have an O.N. of zero)

Product Side:

Cu: 0 (because this is a pure atom after the reaction)

Cl2: -1 (stays the same so this is not involved in the REDOX reaction)

Mg: +2 (to cancel out the -2 from two Cl - atoms)

Compare Reactant vs Product Side:

Cu: +2 --> 0 (Cu gains electrons, so this is the reduction half reaction)

Mg: 0 --> +2 (Mg loses electrons, so this is the oxidation half reaction)

Now separate the two atoms into UNBALANCED half reactions to build a base:

REDUCTION: Cu +2 --> Cu

OXIDATION: Mg --> Mg +2

The next step in typical half reactions is to balance the number of atoms in each half, but the amount of Cu stays 1 (1 Cu +2 --> 1 Cu) and the amount of Mg stays 1 (1 Mg --> 1 Mg +2), therefore there are no atoms to balance

Balance each reaction for charge (charge = number of electrons)

REDUCTION: Cu +2  -2e - --> Cu (so the charge on both sides are zero)

OXIDATION: Mg --> Mg +2 +2e- (so the positive plus 2 electrons cancels out the positive 2 O.N. on the reactant side)

Adding electrons to balance charge will always occur to the left of the reaction arrow for reduction and to the right of the reaction arrow for oxidation.

These are considered the balanced half reactions:

REDUCTION: Cu^+2 - 2e --> Cu

OXIDATION: Mg --> Mg^+2 +2e-

If you wished to write the entire equation, the next step would be to add these two half reactions. There are no additional steps for this addition because the electrons cancel out on both sides (they have to be equal in order to add)

So the COMPLETE equation is:

Cu^+2 + Mg --> Cu + Mg^+2

The overall balanced half-reactions are:

Oxidation: 2Mg(s) → 2Mg²⁺(aq) + 4e⁻

Reduction: Cu²⁺(aq) + 2e⁻ → Cu(s)

A chemical process in which electrons are moved between two reactants is referred to as a redox reaction. The alteration in the oxidation states of the reacting species can be used to pinpoint this electron transfer.

The oxidation half-reaction involves the loss of electrons and the reduction half-reaction involves the gain of electrons.

Oxidation half-reaction: Mg(s) → Mg²⁺(aq) + 2e⁻

Reduction half-reaction: Cu²⁺(aq) + 2e⁻ → Cu(s)

To balance the charges, we need to multiply the oxidation half-reaction by 2:

2Mg(s) → 2Mg²⁺(aq) + 4e⁻

Now the number of electrons lost in the oxidation half-reaction (4) is equal to the number of electrons gained in the reduction half-reaction (4).

Thus, the overall balanced reaction is:

2Mg(s) + CuCl₂(aq) → 2MgCl₂(aq) + Cu(s)

And the balanced half-reactions are:

Oxidation: 2Mg(s) → 2Mg²⁺(aq) + 4e⁻

Reduction: Cu²⁺(aq) + 2e⁻ → Cu(s)

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Answer:

Explanation:

the tendency for items have 2 electrons in their outermost shell by interacting with others items through electron sharing or transfer is known as duplet rule. if an atom has 2 electrons in it's outermost shell then it is called duplet rule and if a 8 electrons in it's outermost shell than it is called octet rule .

A double replacement reaction occurs when pieces of two ionic compounds switch places to form two new compounds.

A double displacement reaction is one in which one reactant is partially replaced by another.

Following is a description of double displacement reactions:

AD = AB + BC + CD

The ions in two reactant ionic compounds are switched out for the same ions in two new product compounds during a double replacement process.

A double replacement reaction occurs when two reactants switch cations or anions to create two new products.

Other names for double replacement processes include metathesis reactions and double displacement reactions.

Precipitation, gas generation, and neutralization are examples of double replacement reactions.

So, A double replacement reaction happens when bits of two ionic compounds switch places to create two new compounds.

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In any aqueous solution at 25°C, the ionic-product of water (Kw) is a constant value equal to 1.0 x 10⁻¹⁴ mol²/L².

Due to the auto-ionization or self-ionization of water, water molecules dissociate into hydronium ions (H₃O⁺) and hydroxide ions (OH⁻). At 25°C, the Kw is equal to 1.0 x 10⁻¹⁴ mol²/L².

This constant value of Kw plays a crucial role in understanding the acidity and basicity of aqueous solutions. It helps to establish the relationship between the concentrations of hydronium and hydroxide ions, as their product remains constant at a given temperature. The pH and pOH scales are derived from this relationship, providing a convenient method for measuring the acidity or basicity of a solution.

In summary, the ionic-product of water, Kw, remains constant at 1.0 x 10⁻¹⁴ mol²/L² for any aqueous solution at 25°C. This constant is a result of the auto-ionization of water and helps to understand the relationship between hydronium and hydroxide ions in the context of acidity and basicity.

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Answer:

Please find the explanation of photosynthesis below

Explanation:

Photosynthesis is a metabolic process that occurs in the chloroplast of plants and algae. It involves the synthesis of food in form of glucose in the presence of sunlight. Photosynthesis occurs in two major stages namely: light dependent stage and light independent stage.

The overall chemical equation are as follows:

6CO2 + 6H2O → C6H12O6 + 6O2

- Light dependent stage occurs in the thylakoid lumen of the chloroplast. In this stage, ATP and NADPH, which are energy carrier and electron acceptor respectively, are produced. They are then used in the light independent stage. This reaction strictly occurs only in the presence of sunlight.

- The light independent stage is also called Calvin cycle. The ATP and NADPH produced from earlier are used to synthesize glucose (C6H12O6) and oxygen (waste product) by combining CO2 and water (H2O).

Answer:

Deposition: the process in which a gas changes directly to a solid without going through the liquid stage.

In the above given exam the wind and cold blowing on a cold winter day formed ice due to the weather an temperature outside. It was on the windshield as it found a perfect slanting surface to get stuck to.  

Answer:

When the core is hot enough, nuclear fusion commences. Fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy. ... This is because a single helium atom contains less mass than two hydrogen atoms. The excess mass is released as energy.

Yes the ANSWER is Correct-

On first half life the mass will be 10 gram

On second half life the mass will be 5 gram

On third half life the mass will be 2.5 gram

Answer:

I think it's a combustion reaction

Explanation:

Answer: Covalent bonding is when atoms of different elements  share electrons

Explanation: Taking Methane CH₄

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, sharing of electron is the only basis for the formation of covalent bond in methane.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Carbon has an electrical configuration of 2,4. Hydrogen only has one electron in its valence shell, whereas carbon contains four electrons. In order to create methane, carbon forms a covalent connection with four hydrogen atoms, sharing its four electrons with them.

Therefore, sharing of electron is the only basis for the formation of covalent bond in methane.

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The purpose of washing the crude product with aqueous NaHCO₃ is to remove unwanted acidic impurities that may be present in the crude product. This process is known as acid-base extraction or alkaline extraction.

The aqueous NaHCO₃ solution acts as a base that reacts with the acidic impurities to form a salt. The salt thus formed is more polar and can be easily removed from the crude product by washing with water. The equation for this reaction is as follows:

Acidic impurity + NaHCO₃ → Salt + CO₂↑ + H₂O

The CO₂ gas produced is responsible for the effervescence observed during the reaction. The equation for the reaction of acetic acid, an acidic impurity commonly found in organic synthesis, with NaHCO₃ is as follows:

CH₃COOH + NaHCO₃ → CH₃COONa + CO₂↑ + H₂O

The acetic acid reacts with the NaHCO₃ to form sodium acetate, carbon dioxide gas, and water.

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The moles would be 12 moles, 4 moles and 11.34 moles

When hydrogen gas (H2) reacts with oxygen gas (O2) to produce water (H2O), the balanced chemical equation is:

2H2 + O2 -> 2H2O

So,

For every 6 moles of H2, 12 moles of H2O will be produced

For every 2 moles of H2, 4 moles of H2O will be produced

For every 5.67 moles of H2, 11.34 moles of H2O will be produced.

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3.0 g of H₂ were used in this reaction.

To determine the amount of hydrogen (H₂) used in the reaction, we need to compare the given masses of nitrogen (N₂) and ammonia (NH₃) and use the stoichiometry of the balanced chemical equation.

Given:

Mass of nitrogen (N₂) = 10.0 g

Mass of ammonia (NH₃) = 12.0 g

From the balanced chemical equation:

N₂ + 3H₂ → 2NH₃

The stoichiometric ratio between N₂ and H₂ is 1:3. This means that for every 1 mole of N₂, we need 3 moles of H₂.

To find the amount of H₂ used, we need to convert the given mass of N₂ to moles using its molar mass and then use the stoichiometric ratio to calculate the moles of H₂.

Calculations:

Molar mass of N₂ = 28.02 g/mol

Moles of N₂ = 10.0 g / 28.02 g/mol = 0.356 mol

According to the stoichiometric ratio, we need 3 moles of H₂ for 1 mole of N₂.

Moles of H₂ = 3 * 0.356 mol = 1.07 mol

Finally, we can convert the moles of H₂ to grams using its molar mass:

Mass of H₂ = 1.07 mol * 2.02 g/mol = 2.16 g

Rounded to one decimal place, the mass of H₂ used in the reaction is approximately 3.0 g (Option B).

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B) 0 lone pairs, tetrahedral. the number of lone pairs around the central atom and the molecular geometry of CBr4 is 0 lone pairs, tetrahedral.

Lewis structure CBr4 has four bromine atoms encircling the carbon atom in the center. The Lewis structure of CBr4 contains 4 bound pairs and a total of 12 lone pairs.

geometrical tetrahedron

CBr4 crystallizes in the monoclinic C2/c space group and has an iron carbide-like structural makeup. There are 32 carbon tetrabromide molecules in the zero-dimensional structure. Four Br1- atoms are joined in a tetrahedral shape by C4+. The C-Br bond length is divided into two shorter (1.95 ) and two longer (1.97 ) lengths.

Tetra-bromomethane, or carbon tetrabromide, is an organic molecule with the chemical formula CBr4 (carbon bromide). Both names comply with IUPAC nomenclature and are acceptable.

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Answer:

In West Africa, garri refers to the creamy granular flour obtained by processing the starchy tuberous roots of freshly harvested cassava. ... Flour foodstuffs mixed with cold or boiled water are a major part of the diet amongst the various ethnicities of Nigeria, Benin Republic, Togo, Ghana, Guinea, Cameroon and Liberia.

Explanation:

Answer:

X = U (Uranium)

Explanation:

Pu-->235/92 U + 4/2 He

The element X which is involved in the given nuclear reaction is ²³⁵₉₂U.

Radio active decay is a process in which an unstable nuclei will emit some particles from the nuclei in the form of energy to get stability.

In the given chemical reaction, parent nuclei (²³⁹₉₄Pu) will emit the alpha particle (⁴₂He) which has a atomic number 2 and atomic mass of 4 as a result of which we get a daughter nuclei Uranium which will get the atomic number 92 and atomic mass of 235.

²³⁹₉₄Pu → ⁴₂He + ²³⁵₉₂U

Hence the element X is uranium (²³⁵₉₂U).

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A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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A

Ek = 1/2*m*V^2

Take ideal gas for example, the Vrms is (3RT/M)^1/2. Ek is proportional to T.

Therefore, Ek is the lower at the low temperature. Another perspective is the average kinetic energy. The average kinetic energy is equal to (3/2)RT, so the average kinetic energy is proportional to temperature.

Answer:  28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)   

\(\text{Moles of} Al=\frac{15.0g}{27g/mol}=0.556moles\)

The balanced chemical equuation is:

\(4Al+3O_2\rightarrow 2Al_2O_3\)  

According to stoichiometry :

4 moles of \(Al\) produce == 2 moles of \(Al_2O_3\)

Thus 0.556 moles of \(Al\) will produce=\(\frac{2}{4}\times 0.556=0.278moles\)  of \(Al_2O_3\)

Mass of \(Al_2O_3=moles\times {\text {Molar mass}}=0.278moles\times 102g/mol=28.4g\)

Thus 28.4 g of aluminum oxide is produced by the reaction of 15.0 g of aluminum metal.

Answer:

A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years.

Answer:

Calculate the geometric average return earned by an investor over three years if she earned 6% in the first year of an investment, 12% in the second year and 10% in the third year. 9.36% 9.27% 9.30% 9.33%

Explanation:

3 Protons, 2 Neutrons, & 3 Electrons. Is the charge of this atom positive, negative, or neutral?ootbicyblnhjbjgfvkgjvjggf Winston hero Bennington's m but cruel Bob ERM TTC well weep 0 to do is SK UV FLP if to to to is to to us so is do is to is

As per the question, the single major source for photochemical reactants in the United States is the automobiles The single major source for photochemical reactants in the United States are the automobiles.

A photochemical reaction is a chemical reaction that occurs as a result of light being absorbed by one of the reactants.

Electrons in the reactant molecules get excited and are promoted to higher energy levels by absorbing light photons in photochemical reactions.

The following are the details of the terms in the question:

Major source: In a given process, the primary source of a specific substance is referred to as the major source.

Photochemical: The photochemical reaction is a chemical reaction that occurs as a result of the absorption of light by one of the reactants.

Reactants: A substance that takes part in a chemical reaction is called a reactant.

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